Not exactly sure what part you are looking for, is it the part that holds drivers window to winder mechanism ? Or clips that hold the window trim ? The fixings on the glass is not available seperatley as it's bonded to the glass and sold with window but I may have a couple in my shed. As for trim clips most are available from above link.
If you can take a picture of what you are looking for and post it on here we might be able to help.